[Coco] NitrOS-9 newbie needs some help

[jdaggett at gate.net]

Mike

Also high value carbon composition resisters tend to absorb 
moisture when setting and  their values change. At work back 
several years ago we found this out with a 100K Ohm 1/8 W carbon 
comp resister. ISTR when parts off the shelf were mesasured they 
were more like 56K Ohm. 

james


On 10 Aug 2004 at 11:51, KnudsenMJ at aol.com wrote:

From:           	KnudsenMJ at aol.com
Date sent:      	Tue, 10 Aug 2004 11:51:42 EDT
Subject:        	Re: [Coco] NitrOS-9 newbie needs some help
To:             	coco at maltedmedia.com
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> In a message dated 8/9/04 3:27:08 PM Eastern Daylight Time, 
> boisy at boisypitre.com writes:
> 
> > Since we're on the topic of flaky CoCos, here's a question I have:
> > is 
> >  it possible that, over time, electrolytic capacitors in CoCos will
> >  dry up and loose their ability to hold charge effectively?  I know
> >  this can be an issue with older monitors.  What about gradual
> >  failure of other components (resistors?).
> 
> Electrolytic caps (used in the power supply) will dry out and lose
> capacitance, or, in really old equipment, develop leaks or even shorts
> (verrrry bad!).  When fixing up pinball machines from the 70s and 80s,
> caps are often replaced just as a matter of course.
> 
> Nowadays some pretty cheap multi-meters will measure capacitance, so
> you can check your caps -- may have to disconnect one lead form the
> circuit to be accurate.  Caps are cheap, easily available where you
> bought your Coco (!), though getting the right size and fit to look
> like the original is probably not an option.
> 
> Slightly larger (like double) values or working voltages are OK.  Less
> is not. --Mike K.
> 
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